Teeth for excavating dippers and the like



Nov. 19, 1929. w.'E. MILEY TEETH FOR EXCAVATING DIPPERS AND THE LIKE Original Filed Aug. 17, 1926 2 Sheets-Sheet A TTOR/VE )4 Nov. 19, 1929., 'W.E. MILEY 1,736,045

TEETH FOR EXCAVATING DIPPERS AND THE LIKE Original Filed Aug. 17, 192 2 s t m 2 Patented Nov. 19, 1929 UNITED ,s'rA'n-zs PATENT OFFICE WALTER E. MILEY, OF MARION, OHIO, ASSIGNOR T0 TEE MARION STEAM SHOVIEL COMPANY, OF MARION, OHIO, A PORIPORATION OF OHIO TEETH FOR EXCAVATIN 'DIPPERS AND THEE LIKE Original application filed August 17, 1926, Serial No. 129,842. Divided and this application filed February 7, 1828. Serial Io.- 252,602.,

This invention relates to teeth for excavating dippers and the like and is designed more particularly for use on the excavating dippers of power shovels, the present application being a division of the application for atent filed by me August 17, 1926, Serial 0. 129,842.

The dipper of a power shovel is usually provided with a plurality of teeth spaced apart across the forward edge of the front of the dipper. These teeth extend forwardly from the forward edge of the dipper front for a considerable distance and each tooth has a rearwardly extending portion arranged beneath the dipper front, so that the forward edge of the front .is arranged at a distance from the forward ends of the teeth and from the lower surfaces of the. teeth and will pass over, without removing, considerable quantities of material which lies between the paths of the teeth. When the dipper is in its fully retracted position and is resting upon the points of the teeth the dipper front is in an inclined position with relation to the surface of the work and the forward edge thereof is spaced such a distance from said surface that it will pass over relatively large quantities of material lying between the paths of the teeth. As the dipper is advanced during the excavating operation the front will assume a position approximately parallel with the surface of the work but even in this position the forward edge of the dipper front is spaced from thesurface of the work a distance corresponding to the thickness of the lower portions of the teeth and will pass over considerable quantities of material. As a result the surface of the work is left in a rough condition with relatively large quantities of loose material thereon and in many classes of excavating work, such as street and road work, this is highly objectionable and it is necessary that the surface be smoothed and the loose material removed by means other than the dipper. Further, the forward edge of the dipper front functions as a cutter and is therefore subject to severe wear which makes it necessary to renew the same at more or less frequent intervals.

One object of the invention is to provide dipper point from wear.

A further object ofthe invention is to pro vide an excavating dipper having two-part teeth with supplemental cutters mounted on the removable points of said teeth and adjustable thereon to maintain the edges thereof in proper relation to said points.

r Other objects of the invention will appear as the device is described in detail. In the accompanying drawings Fig.1 is a side elevation of a dipper tooth having the supplemental device formed integral with the point thereof; Fig. 2 is a plan view of portions of two teeth showing a single supplemental device arranged between but carried by the points of the two teeth; Fig. 3 is a section taken on the line 3-3 of Fig. 2; and Fig. 4 is a front elevation of a portion of the dipper showing the teeth and supplemental devices. Y I

In these drawings I have illustrated two embodiments of my invention and have shown the same as applied to a two-part tooth of the type shown and described in the application for patent filed by me April 22, 1925, Serial No. 24,957. It will be understood, however, that these particular embodiments have been chosen for the purpose of illustration only, that the invention may take various forms and may be applied to dipper teeth of various kinds.

In that form of the invention here illustrated I have shown the same as applied to a two-part tooth comprising a base 1 and point 2 detachably secured to said base. The upper portion of the tooth is shaped, at 15, to provide what is known as a duck bill tooth. The base of-the tooth has a rearwardly extending lower portion 3 and a rearwardly extending upper portion 4 spaced apart to receive between them the forward portion of. the dipper I each arm has an inwardly extending lug 10 adapted to enter the adjacent recess 8 in the front 5, which is rigidly secured to the tooth by means of one or more rivets 6 extending through the same and through the upper and lower portions of the tooth. The base of the apart to receive between them the central forwardly extending portion 7 of the base and base. After the lugs have been inserted in the recesses the point of the tooth is moved to the osition shown in the drawings and s rigi ly secured in that position by means of a bolt 11. The base of the tooth also has forwardly extending arms 12, the forward portions of which contact with the respective sides of the point 2 and braoe'the same against lateral strain.

Arranged alongside of the several teeth and between adjacent teeth are supplemental devices of such a character and so arranged that they will serve to remove from the surface of the work any material lying between the teeth below the front of the dipper and will also servevto protect the dipper front from wear. Preferably these devices are in the form of supplemental cutters mounted on the points of the teeth in inclined positions with their forward ends adjacent to the lower surface of the teeth and their upper ends adjacent to and in advance of the forward edge of the dipper front so that the material between the teeth will be lifted thereby, and delivered onto the dip r front.

In that form of e device shown in Fig. 1 the supplemental devices or cutters are in the form of plates 16 formed integral with the removable points of the teeth and extending laterally from the respective sides thereof, the forward edges of the plates being beveled to provide cutting edges as shown at 14.

With this arrangement, the supplemental outter forms an integral part of the point of the tooth and is applied to and removable from the base along with that tooth.

In Figs. 2 and 3, I have shown the supplemental device as formed separately from the teeth and removabl mounted on the points thereof. In this orm also the points of the teeth are provided with ribs or plates 27 extending laterally therefrom and inclined upwardly and real-wardly and the supplemental cutter is inthe form of a single blade 31 which is mounted on the laterally extending portions 27 of the points. of the teeth and is rigidly secured thereto. As here shown, the laterallyextending portions or plates 27 of the points are relatively narrow but are provided with lugs 28 extending one toward the other and having in their adjacent edges recesses 29 which combined to form a bolt 5 hole to receive a bolt '35 which extends seated in the depression. In this manner.

the cutter may be adjusted lengthwise of the supporting plates to maintain its forward edge in pro er relation to the oints of the teeth. Pre erably this forwar edge of the cutter is substantially flush with lower surfaces .of the oints so that it will remove all material rom the surface of the work.

While the bolt alone may be relied upon to secure the supplemental cutter in positlon on the so To this end the supporting plates 21 have near their rear ends a series of teeth 30 and and the blade or cutter has near its opposite edges dependingteeth 34 adapted to cooperate with the teeth 30 'to hold the cutter against lengthwise movement due to the thrust thereon. It will be apparent that the sup lemental cutters are carried by the points of the teeth and ma be mounted on or removed from the bases a ong with the points, and that the cutters may also be ad usted to move their forward edges downwardly as they wear away and thus maintain these edges in proper relation to the points. If the sup lemental cutter is worn out before the point 0 the tooth is worn out it may be removed and 'a new cutter substituted therefor.

While I have shown and described certain embodiments of my invention I wish it to be understood that I do not desire to be limited to the details thereof as various modifications may occur to a erson skilled in the art.

ports I have shown means for positive-' ly loc mg the cutter against displacement.

Havin now ully described my invention,

what I 'c aim as new and desire to secure by Letters Patent, is:

1. In an 'excavatin dipper, a plurality of teeth each com ri'smg a base secured to the front of said dlpper and apoint detach.- ably secured to said base, and parts carried by said points of said teeth and arranged wholly between said teeth and in advance of the dipper front to protect the latter from wear. 2. In an excavating dipper, a plurality of teeth each comprising a base secured to the front of said dipper and a point detachably secured to said base and having its lower surface below the plane of said front, and inclined parts carried by the removable points of said teeth, arranged between adjacent teeth and extending from the lower portions of said teeth upwardly and rearwardly to positions ad'acent to the forward edge of said dipper ront.

3. In an excavating di per, a plurality of teeth each comprising a ase secured to the front of saiddipper and a point detachably secured to said basei supplemental devices ar ranged between a jacent teeth, and means located between said teeth for supporting said supplemental devices on the points of the respective teeth.

4. In an excavating dipper, a plurality of teetheach comprising a base secured to the front of said dipper and a point detachabl secured to said base, the points of said teet having parts forming supports, supplemental.

cutters arranged between adjacent teeth and mounted on said supports, and means for rigidly securing said cutters to said supports.

5.' In an excavating dipper, a plurallty of teeth each comprising a base secured to the front of said dipper and a point detachably secured to said base, said points having laterly extending parts forming supports, asingle cutter arranged between each pair of adjacent teeth and mounted on the supports of the respective points, and means for rigidly but remova-bly securing said cutter to said supports.

6. In an excavating dipper, a plurality of teeth'each comprising a base secured to the front of said dipper and a point detachably secured to said base, said points having laterally extending parts forming. supports, a single cutter arranged between each pair of adjacent teeth and adjustably mounted on the supports of the respective points, and means for rigidly securing said cutter in adj usted positions on said supports.

7. In an excavating dipper, a plurality of teeth each comprising a base secured to the front of said dipper and a point detachabl secured to said base, the pomt of each toot having inclined plates extending laterally from the respective sides thereof, cutters arranged between adjacent teeth and supported by .the respective inclined plates, and means for rigidly securing said cutters to said inclined plates.

8. A tooth for an excavating dipper or the like comprising a base and a polnt detachably secured to said base and having its rear portion of a thickness substantially equal to the thickness of the adjacent ortion of said base, and inclined plates rigidly mounted on said point between the upper and lower edges thereof and extending laterally from the respective sides thereof.

In testimony whereof, I aflix my signature hereto.

WALTER E. MILEY. 

